Tool holder



T. D. BASCOM TOOL HOLDER Feb. 28, 1933K.

Filed Jan. 2l, 1931 INVENTO R 7290/1445 nsco/w Patented Feb. 28, 1933UNITED STATES THOMAS D.

BAscoM, or CLEVELAND, oHIo, ,AsSI`GN1ai 'ro THE' STANDARD Toor. z.

COMPANY, VO15' CLEVELAND, OHIO, .A CORPORATIQN'F OHIO i y,

Toor. Honnni` Application med January 21, 1931.` serian 110. 510,136.' iy The invention disclosed in this application relates to a combined toolholder and tool. The object of the present invention Ais to provide acombined tool holder and tool 5 wherein tools, like drills, taps o r thelike,

are rigidly 'held in the tool holder` and'provision is made between theholder` and the tool itself for producing a positive drive which willprevent slippage and produce more effective work.

The invention will be brought out in the following description, drawingand claim.

Referring to the drawing, Fig. 1 is an elevation of the combined holderand tool; Fig. 2 is a view partly in vertical section; Fig. 3 is asimilar view taken at 900; Fig. 4 is a section upon the line 4 4, Figs.l2 and 3; Fig. 5 isa section upon the line 5-5, Figs. 2 and 3; Fig. 6 isa view in elevation showl ing a single collet member, with dotted linesindicating the different bores for the different tools, together withthe upper ends of different tools of dierent sizes; Fig. 7 is a similarview taken at 90; Fig. 8 shows the collet member for drills of smallsize; Fig. 9 is a view taken at 90; and Fig. 10 is a top plan view ofthe collet.

In the embodiment shown, 1 represents a holder shank of the usualtapered form having the usual driving tongue 2. This shank and tonguelit into the socket of the driving spindle ofthe drill press or othermachine, and the tapered arrangement serves to snugly hold the shank inplace. This shank hasV a bore 3 at its lower end forming a sleeve'portion 4 which is externally threaded at 5. In the bottom of the boreare arranged suitable pins 6, as shown in Figs. 2 and 4. Engaging thethreads 5 of the sleeve portion 40 4 is a clamping nut 7 having aninternally tapered face 8.

Engaging in. the sleeve portion 4 is a collet member 9 provided with atransverse opening 10A near one end, Fig. 6, `and a diametrical slot 11extending out from this opening 1()k to the endv of the collet member.The two half-round portions thus formed are provided with tapered seats12 for engagement by the tapered face 8 of the clamping nut 7, so thatwhen the clamping nut is drawn up, 'the collet member isfcollapsed uponthe tool. The upper end ofthe collet member is transversely slotted, asindicated at 13, andfV thisslot is adapted to engage the p'i ns6` and .Yprovide a drive fbetweenthfeshank 1 1and the 55 collet member. There area plurality ofcollet members, one for eahdrill, tapjor other tool,landeach is providedwitha'proper sizedVv opening orrbore 14 for'receivingthepartic'u-V y lar dril1,tap`or othertool. The bore in each r case extendsupto thebottom" of the slot'13,; as shown -in Figs.6andf7.""

Each of thedrills, taps or other'toolsis" provided at its shank' endwith 'a driving baaaiauiqared ariaandthisdriving blade l is similar tothe driving blade 2 and is formed by flattening the sides of the shank.These blades are adapted to lit up into the slots 13 of the collet,members' and the shoulders 16 of the tools form a stop so that theoperative may be sure that the tool passes up into locked Y position. 1Where small drills and taps are utilized and the Shanks are of lessdiameter than the v thickness of the pins 6, the heads of the colletmembers are arranged as shown in Figs. 8, 9 and 10, wherein thecolletmembers are provided with narrow slots, indicated at 17, and

these slots are of a width such that they will'y Y l Y properly receivethe driving blades of the Sori smaller sized tools. In order to stillmaintain the drive between the collet members `and the shank,the headsare milled inwardly from each side to provide recesses 18 forengagementwith the pins 6', in spite of the inter-f` 85"` mediate slot17 being much narrower. y

In use the operative selects his drill, tap or other tool and alsoselects'tlie propercollet i member to go with it. He then inserts thesei two parts in the sleeve portion and draws up the clamping nut. Theclamping effect Vof course creates collapse of the half-round portionsof the .collet member upon the shank of the drinV and holds, a armiy.The blade ofV 5.,

Having thus described my invention, I claim:

f In combination, a tool holder and a tool adapted to be removablyconnected thereto for 5 rotation therewith, said holder having a shankprovided at its tool-holding end with a'clamping` nut threaded thereon,said toolholding shank end being also provided with f a generallycylindrical, axially disposed sock- 10 et for receiving 'a collet vandthe connecting -v end of the tool,v said collet being adaptedto receivesaid tool connecting end, said shank being provided at the inner end ofsaid sock- Vet with two dian'ietrical-ly-Vopposed driving l5 pinsprojecting into said socket inner end, said collet being a one-piecemember provid ed at its inner end with a diametrically disposed slot forreceiving the-driving pinsof said shank, Ywherebysaid collet isconnected Y 20 to Said shank for rotation therewith,l said collet beingprovided at its outer end with a pair of clamping jaws ladapted to lbeclamped about saidtool by said clamping nut, said tool being provided atits connecting end with a 2*drivingtang adapted to extend into thediametrically disposed slot of said collet, whereby said tool isconnected to said collet :torro-V tation therewith. v

- InV testimony whereof I hereby aflx my signature.' f

l yTHOMAS D. BASCOlVL

